Solar Panel Warranty in India: What's Covered and What's Not

The Short Answer

Solar panels in India come with two warranties: a product warranty (10–15 years) covering manufacturing defects, and a performance warranty (25–30 years) guaranteeing minimum output levels. A 25-year performance warranty from a Tier 1 brand typically guarantees ≥84% output at year 25. The warranty is only as reliable as the manufacturer's ability to honour it — prioritise brands with Indian manufacturing or service presence.

Product Warranty vs Performance Warranty

These are two separate warranties that cover different things:

Aspect	Product Warranty	Performance Warranty
Duration	10–15 years	25–30 years
Covers	Manufacturing defects, material failures	Output degradation beyond specified limits
Examples	Delamination, junction box failure, cracked glass (not from impact), cell interconnect breaks, backsheet peeling	Panel producing below guaranteed percentage of rated power at a given year
Claim trigger	Physical defect visible or causing failure	Measured output falls below warranty curve
Remedy	Repair, replace, or refund (manufacturer's choice)	Replace or compensate for lost output

Both warranties are provided by the panel manufacturer, not the installer. However, your installer is often the intermediary who initiates the claim process on your behalf.

Understanding the Performance Warranty Curve

A performance warranty guarantees minimum output at each year of the panel's life. There are two types:

Linear warranty (better): Guarantees a specific output percentage every year, declining gradually. Example: 97% in year 1, declining by 0.5% per year, reaching 84.8% at year 25. You can claim at any point if output falls below the curve.

Step warranty (worse): Only guarantees at two points — typically 90% at year 10 and 80% at year 25. Between those points, there is no guarantee. This means the manufacturer is not liable if your panel drops to 82% at year 9.

Year	Linear Warranty (typical)	Step Warranty (typical)
1	≥97%	Not specified
5	≥95%	Not specified
10	≥92.5%	≥90%
15	≥90%	Not specified
20	≥87.5%	Not specified
25	≥84.8%	≥80%

Always choose panels with linear warranty. All Tier 1 brands now offer linear performance warranties. Step warranties are typically found on budget or lesser-known brands.

Warranty Terms by Major Brands

Brand	Product Warranty	Performance Warranty	Year 25 Guarantee
Waaree	12 years	25 years (linear)	≥84.8%
Tata Power Solar	12 years	25 years (linear)	≥84%
Adani Solar	12 years	25 years (linear)	≥84%
Vikram Solar	12 years	25 years (linear)	≥84.8%
LONGi	15 years	25 years (linear)	≥86.2%
Jinko Solar	15 years	30 years (linear)	≥87.4%
Canadian Solar	15 years	25 years (linear)	≥84.8%

LONGi and Jinko lead on warranty terms — 15-year product warranty and highest year-25 guarantees. Among Indian brands, Waaree and Vikram offer the strongest performance commitments.

Full brand comparison →

What Voids Your Solar Panel Warranty

Avoid these common actions that can void your warranty:

Installation by non-certified installer: Most manufacturers require installation by an authorised or certified installer. DIY installation or work by an unqualified electrician can void both product and performance warranties.
Physical damage: Cracks from impact (hail, falling objects, foot traffic), improper handling during cleaning, or pressure washer damage are not covered.
Improper mounting: Drilling through panel frames, mounting at incorrect angles that cause water pooling, or using incompatible clamps.
Electrical modifications: Altering the junction box, rewiring bypass diodes, or connecting panels in configurations outside the manufacturer's specifications.
Environmental damage exclusions: Lightning strikes, floods, fire (unless caused by panel defect), and acts of nature are typically excluded.
Removing or altering nameplate/serial number: The serial number is how the manufacturer tracks warranty eligibility.

Tip: Keep your purchase invoice, installation certificate, and warranty card in a safe place. Photograph the serial numbers of all panels on the day of installation.

How to File a Warranty Claim

If you suspect a panel is underperforming or defective:

Document the issue: Take photos of visible defects. For performance claims, export data from your inverter monitoring app showing output decline over time.
Contact your installer first: Most installers handle warranty claims on your behalf as part of their service. They have direct channels with manufacturers.
If installer is unresponsive: Contact the manufacturer directly via their website or customer care. Provide your panel serial number, purchase invoice, and installation date.
Independent testing (for performance claims): The manufacturer may send a technician or require an independent lab test (I-V curve measurement) to verify that output has fallen below the warranty curve. This test costs ₹2,000–₹5,000 per panel if you commission it independently.
Resolution: The manufacturer will either repair, replace, or compensate. Replacement panels may be equivalent (same wattage) rather than identical models if the original model is discontinued.

Timeline: Expect 30–90 days for resolution depending on the manufacturer and claim complexity. Premium brands like Tata Power Solar are known for faster resolution.

Inverter and Installation Warranties

Your solar system has three separate warranties:

Component	Typical Warranty	Provided By
Solar panels	12–15 yr product + 25–30 yr performance	Panel manufacturer
Solar inverter	5–10 years	Inverter manufacturer
Mounting structure	5–10 years	Installer or structure manufacturer
Workmanship / installation	1–2 years	Installer

The inverter is the weak link — with a 5–10 year warranty against a 25-year panel life, you will likely need one inverter replacement. Budget ₹20,000–₹60,000 for this at the 10–15 year mark.

Some inverter brands offer extended warranty purchases (e.g., Fronius offers up to 20-year extended warranty). This can be worth it if you want peace of mind.

Warranty Insurance and Third-Party Guarantees

For additional protection beyond the manufacturer's warranty:

Comprehensive solar insurance: Some general insurers (HDFC Ergo, ICICI Lombard) offer standalone solar system insurance covering damage, theft, and output underperformance. Premiums run ₹1,000–₹3,000/year for residential systems.
Installer AMC plans: Annual maintenance contracts from your installer typically include routine inspections that catch warranty-eligible issues early. Maintenance guide →

For most homeowners, choosing a Tier 1 brand with strong Indian presence is sufficient protection. Insurance is worth considering for systems above 5kW or in extreme weather zones.

Choose Panels with Warranties You Can Trust

A warranty is only as good as the company behind it. When comparing quotes through Solar Vipani, each installer specifies the exact panel brand and model — so you can verify warranty terms before committing.

Get your free solar quotes →

Common questions

How long is the warranty on solar panels in India?

Solar panels come with two warranties: a product warranty of 10–15 years covering manufacturing defects, and a performance warranty of 25–30 years guaranteeing minimum output. Most Tier 1 brands guarantee ≥84% output at year 25 under a linear performance warranty.

What is the difference between product and performance warranty?

Product warranty covers physical/manufacturing defects — delamination, junction box failure, cell interconnect breaks. Performance warranty covers output degradation — if your panel produces below the guaranteed percentage at any year, you can claim. You need both for full protection.

What can void my solar panel warranty?

Common warranty voiders include: installation by a non-certified installer, physical damage from impact or pressure washing, improper mounting (drilling through frames), electrical modifications to the junction box, and removing the serial number plate. Always use a certified installer and follow manufacturer cleaning guidelines.

How do I file a solar panel warranty claim?

Contact your installer first — they typically handle claims on your behalf. Provide photos of defects or inverter monitoring data showing output decline. The manufacturer may send a technician for verification. Resolution (repair, replace, or compensate) takes 30–90 days depending on brand and claim type.

Is a 25-year solar panel warranty reliable?

From Tier 1 brands with Indian manufacturing or service presence — yes. Companies like Waaree, Tata, Adani, LONGi, and Jinko have the financial stability and local infrastructure to honour long-term warranties. Avoid unknown brands without Indian presence, as filing claims across borders is extremely difficult.

Should I buy extended warranty for my solar inverter?

It can be worthwhile. Standard inverter warranties are 5–10 years, but panels last 25+ years. An extended warranty to 15–20 years (offered by brands like Fronius and SMA) costs ₹5,000–₹15,000 but avoids a ₹20,000–₹60,000 replacement cost. Evaluate based on brand reliability and your risk tolerance.

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